The effects of decomposed chicken manure on the yield and quality of rice and soil physicochemical properties were studied for the poor soil structure of the foot-entangled soil in Dongtai.According to the principle of equal nitrogen substitution,seven treatments were set up,including no fertilization treatment,conventional treatment,and chicken manure replacing nitrogen fertilizer by 10％,20％,30％,40％,and 50％,respectively.The results showed that compared with conventional treatment,chicken manure replacing nitrogen fertilizer significantly increased soil total nitrogen(0.86％-3.45％)and organic matter content(0.57％-9.53％),but decreased bulk density(0.73％-4.41％).Chicken manure replacing nitrogen fertilizer improved the yield and quality of rice,of which 20％nitrogen fertilizer substitution significantly increased rice yield by 19.44％(P＜0.05)and the nitrogen utilization rate by 16.58％(P＜0.05).Based on the economic benefits,chicken manure replacing 20％nitrogen fertilizer had the highest economic benefits,increasing rice yield and quality and improving soil structure.It is a relatively optimal proportion of chicken manure replacing nitrogen fertilizer and is worth promoting and applying.
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